Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f89ebef96bdf3…

MALICIOUS

PDF

82.6 KB Created: 2021-02-25 12:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 56dec151171ce78dc9d4f17cb96dc063 SHA-1: 3e2f8b1b4e9d03e8fcfb4f089ad3da69a06d83fe SHA-256: b85f89ebef96bdf3a52985835525bfb52dd98d7685a2f20fc887bfd2c727302c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to device resets, which is likely a lure to encourage interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=how+to+hard+reset+a+polaroid+tablet PDF link annotation
    • https://cdn.sqhk.co/veletafi/heNUjha/hungry_shark_world_all_sharks_2020.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/mumedonujotenokeges.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/20439407045.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/forafujiz.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/ASJ7Xje/2282937869.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwokosokif/aiaZOjm/77137173693.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ge1sieA/42031164405.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/7KGRiQb/56515019923.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/NJZhjiy/81519559130.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/U4fIhj4/63423351719.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/48688478913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/69371494566.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/how_to_write_a_literature_review_essay_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/torirekexuxojidi.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/ardy_cape_1_guide_osrs.pdfIn PDF document text
    • http://nelegolir.epizy.com/06_honda_civic_hybrid_battery_replacement.pdfIn PDF document text
    • http://bobitemobo.epizy.com/gamifabuvixuxosig.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/varewakelavijuforofavub.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=966281&s=60252bb20d2b338d50cf810f8c33bf3eIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • https://forums.androidcentral.com/showthread.php?t=966281&s=60252bb20d2b338d50cf810f8c33bf3eIn PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 5240 bytes
SHA-256: f7998983d06dd25ea1ff7446f8c69a3acf5a434ee8197195e3cfa924abb1b90a
font_01_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 11040 bytes
SHA-256: d8eb69e77b3e6b86a4b374cc8e5b32fd81e4c49be3a6a8f7647e46aec1bb0a63

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